Printer&#39;s rule.



iUirnn CLARENCE C. MARDER, OF CHICAGO, ILLINOIS.

i-"RINTERS RULE.

SPECIFICATION' forming part of Letters Patent No. 662,365, dated November 20, 1900.

IApplioation filed June 14, 1900. Serial No. 20,335. (No model.)

To all whom it may concern:

Be it known that I, CLARENCE C. MARDER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain newl and useful Improvementsin Printers Rules; and I do declare the following to b a full,clear,and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in printers rules, and particularly to what are known as round-corner brass or other metallic rules for forming curved printingsurfaces. I-Ieretofore rules of this type have been made by simply bending or curving an ordinary straight rule, the bottom having practically the same curve as the top, making the rule difficult to lock up.

The object of my invention is to obviate this difficulty and provide a rule having a curved top printing` edge and a square or approximately right-angular bottom edge, whereby the rule may be locked up in an effective manner.

The invention consists in a rule embodying certain novel features of construction, as will be hereinafter more fully described, and particularlypointed out in the appended claims.

In the' drawings hereto annexed -and forming a part of this specification, Figure l is an outer perspective view of a round-corner rule constructed in accordance with my invention. Fig. 2 is an inner perspective view of the same. Fig. 3 is a vertical section through the corner of the rule. Fig. 4 is a central longitudinal section looking toward the printing edge.

A in the drawings represen ts the rule,which consists of a plate of brass or other suitable n1etal,provided with a righ t-angular end (t and a top printing edge or face b, which is curved or rounded at the corner or angle, as shown, forming what is generally known as a roundcorner rule. Heretot'ore rules of this character have been made by bending an ordinary straight rule to form the end a. The objec* tion to this construction is that the top and bottom edges extend on the same line of curvature at the corner or angle, thus rendering it difficult to obtain a iirm bearing of the furni ture on the rule and make agood lock up. To obviate this objection, I take an ordinary brass rule and subject it to the action of a suitable die, which stamps the end a up ata.

Thus the corner of the printing edge iscurved or rounded in the proper manner, while the remainder of the corner portion of the. rule is square, so that a firm bearing of the furniture may be obtained and the rule secu rely'locked up. The outersurface of the corner or angle maybe dressed down by means of a file or other suitable implement and made slightly curved. or rounded, as shown'at CZ, to secure a smooth finish, if desired.

Havingthus described my invention, what Iclaim, and desire to secure by Letters Patent, is-

l. A round-corner printers rule having an end portion extending approximately at right angles to the body, the lower edges of the body and end portion being straight and substantially at right angles to each other,

and the upper edges thereof, constituting the nay hand in presence of tWo subscribing Wit- `curved at the corner, substantially as denesses.

scribed.

4: A round-corner printers rule having CLARENCE Q MARDER. a right-angular base or lower edge and a 5 curved upper or printing edge, substantially Witnesses:

as described.

In testimony whereof I have hereunto set H. C. DUNBAR, ALBERT MACH. 

